CN103362611A - System and method for increasing fuel economy of a vehicle including a SCR catalyst - Google Patents

System and method for increasing fuel economy of a vehicle including a SCR catalyst Download PDF

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Publication number
CN103362611A
CN103362611A CN2013101139303A CN201310113930A CN103362611A CN 103362611 A CN103362611 A CN 103362611A CN 2013101139303 A CN2013101139303 A CN 2013101139303A CN 201310113930 A CN201310113930 A CN 201310113930A CN 103362611 A CN103362611 A CN 103362611A
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China
Prior art keywords
amount
urea
egr
stored
scr catalyst
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Granted
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CN2013101139303A
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CN103362611B (en
Inventor
E·库尔茨
P·J·坦尼森
W·C·罗那
W·阿拉舍
D·A·梅
J·P·斯泰容
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Ford Global Technologies LLC
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Ford Global Technologies LLC
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/021—Introducing corrections for particular conditions exterior to the engine
    • F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B39/00—Component parts, details, or accessories relating to, driven charging or scavenging pumps, not provided for in groups F02B33/00 - F02B37/00
    • F02B39/02—Drives of pumps; Varying pump drive gear ratio
    • F02B39/04—Mechanical drives; Variable-gear-ratio drives
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D21/00—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas
    • F02D21/06—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air
    • F02D21/08—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air the other gas being the exhaust gas of engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D41/0047—Controlling exhaust gas recirculation [EGR]
    • F02D41/005—Controlling exhaust gas recirculation [EGR] according to engine operating conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
    • F02D41/401—Controlling injection timing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1406—Storage means for substances, e.g. tanks or reservoirs
    • F01N2610/142—Controlling the filling of the tank
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
    • F01N2900/1806—Properties of reducing agent or dosing system
    • F01N2900/1814—Tank level
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/0002—Controlling intake air
    • F02D41/0007—Controlling intake air for control of turbo-charged or super-charged engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/3809—Common rail control systems
    • F02D41/3836—Controlling the fuel pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/02—EGR systems specially adapted for supercharged engines
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

Methods and systems for increasing fuel economy of a vehicle including a SCR catalyst are presented. In one example, an amount of EGR provided to an engine is decreased in response to performance of the SCR being within a predetermined range of performance. The methods and systems may increase vehicle fuel economy while vehicle tailpipe emissions are achieved.

Description

Improve the system and method for the fuel economy of the vehicle that comprises the SCR catalyst converter
Technical field
Background technique
Engine running can be through regulating to improve engine emission or fuel economy.Yet the motor that improves fuel economy is regulated (for example, EGR amount and fuel injection timing) can also increase engine emission.To regulate the exhaust gas recirculatioon (EGR) that offers motor to measure and utilize selective catalytic reduction system operating (SCR) to process engine exhaust in the situation that significantly do not increase the method that fuel consumption improves emission by exhaust pipe.Increase the EGR amount that offers motor and can reduce engine charge NOx, and can significantly not increase fuel consumption.Further, the SCR that is positioned at the processing exhaust of engine exhaust system can reduce air inlet NOx, thereby lower blast duct for vehicle NOx discharging is provided.In this manner, the combination by EGR and treated device final vacuum can reduce outlet pipe NOx.Yet when increasing EGR, the fuel economy of motor can reduce slightly.Therefore, the motor fuel Economy can be lower than expection.
Summary of the invention
The invention personnel have recognized above-mentioned inferior position, and have set up the method for running engine, and the method comprises: response is stored in the NH in the SCR catalyst converter 3Amount and the urea amount that is stored in the case are regulated the EGR amount that offers motor.
By when SCR catalyst converter efficient is high, reducing the EGR amount that offers motor, can improve vehicle fuel economy, satisfy simultaneously desirable emission level.For example, the NH in being stored in the SCR catalyst converter 3Amount is during greater than threshold level, and the efficient of SCR catalyst converter can be higher.Therefore, by reduce EGR can be under the higher condition of fuel efficiency running engine, by high-efficiency operation SCR catalyst converter emission by exhaust pipe is maintained below the threshold level simultaneously.Further, when case did not empty basically, the residue urea amount that can respond in the case was regulated the EGR amount that offers motor.Such running can the permission system improves the motor fuel Economy and limit simultaneously urea and use, thus provide desirable urea box recharge between every.
In another embodiment, the method for running engine comprises: the urea amount that response is stored in the case is regulated the EGR amount that offers motor; Sediments in the response vent systems forms the estimator limit injection to the urea amount of the vent systems of SCR catalyst converter upstream; And the urea amount restriction of response injection offers the minimizing of the EGR amount of motor.
In another embodiment, the method comprises that further also response is stored in the NH in the SCR catalyst converter 3Amount is regulated the EGR amount that offers motor.
In another embodiment, the NH in being stored in the SCR catalyst converter 3When amount reduces, increase the EGR amount that offers motor.
In another embodiment, the NH in being stored in the SCR catalyst converter 3When amount increases, reduce the EGR amount that offers motor.
In another embodiment, the method further comprises fuel injection beginning or the minimizing engine booster that shifts to an earlier date injection timing when the EGR amount that offers motor reduces.
In another embodiment, the method further comprises and reduces the urea amount that is ejected into vent systems when urea amount in being stored in case reaches the essential estimation urea amount of predetermined condition less than vehicle.
In another embodiment, the method for running engine comprises: response is in the SCR catalyst converter property regulation engine operating condition in the pre-determined characteristics scope, to enter fuel economy mode; The SCR catalyst converter property regulation that reaches threshold level with response offers the EGR amount of motor.
In another embodiment, after SCR catalyst converter performance reached threshold level, response was stored in the NH in the SCR catalyst converter 3Amount, SCR catalyst temperature and the urea amount that is stored in the case are further regulated the EGR amount.
In another embodiment, threshold level is predetermined efficient, and further comprises, when the urea amount in being stored in case is not more than vehicle and reaches the urea amount of predetermined condition, reduces the urea amount that is ejected into the vent systems that comprises the SCR catalyst converter.
In another embodiment, when the EGR amount that offers motor reduces, reduce supercharging or the in advance beginning of fuel injection timing.
In another embodiment, the method comprises that further increase is ejected into the urea amount that comprises SCR catalyst converter vent systems, and it improves SCR catalyst converter efficient and allows simultaneously vehicle to reach the predetermined condition relevant with urea amount in the case.
This explanation can provide some advantages.Particularly, the method can reduce engine emission and improve the motor fuel Economy.In addition, between the method urea box that can also help to provide desirable recharges every.Further, thus the method can reduce urea-spray during SCR catalyst converter efficient is higher to prolong urea box and recharges the interval.
The above advantage of current description, other advantages and feature will be apparent according to following detailed description (when reading individually or by reference to the accompanying drawings).
Should be appreciated that it is to select in order to introduce viewpoint in concise and to the point mode that above general introduction is provided, it is further described in detailed description.The non-crucial or essential feature of determining claimed theme that means, subject area only is defined by the following claims.And claimed theme is not limited to solve the mode of execution of the above or described any inferior position of any part of the present disclosure.
Description of drawings
Fig. 1 illustrates the schematic diagram of motor;
Fig. 2 illustrates the drawing of SCR catalyst converter transformation efficiency and SCR catalyst converter intake temperature;
Fig. 3 illustrates SCR catalyst converter NH 3The gentle EGR gain of storage of water and the drawing of time;
Fig. 4 illustrates the drawing that forms zone and the restriction of EGR component based on the exemplary urea deposits thing of the urea flow restriction relevant with the urea sludge;
Fig. 5 is the exemplary process diagram of method of fuel economy that has the vehicle of SCR catalyst converter for raising;
Fig. 6 is the example vehicle with the motor that comprises the SCR catalyst converter.
Embodiment
The present invention relates to improve the fuel economy of the vehicle with SCR catalyst converter.Fig. 1 illustrates an example of supercharged diesel engine, and wherein when the SCR catalyst converter turned round in the high-efficiency operation zone, the method for Fig. 5 can be regulated engine operating condition, thereby reduced fuel consumption.Fig. 2 illustrates exemplary SCR catalyst converter transformation efficiency and draws, and it determines can reduce the temperature range that motor fuel consumes during engine running.Fig. 3 illustrates and can respond SCR NH 3The example of the mode of stored adjustment EGR.In some instances, the flow of urea of vent systems is led in restriction, thereby reduces the possibility that sediments as shown in Figure 4 forms.Be provided for reducing the method that the motor fuel of the motor that comprises the SCR catalyst converter consumes among Fig. 5.The example vehicle of method that at last, wherein can application drawing 5 shown in Fig. 6.
With reference to figure 1, internal-combustion engine 10 is by 12 controls of electronic engine control device, and this internal-combustion engine 10 comprises a plurality of cylinders, one of them cylinder shown in Fig. 1.Motor 10 comprises firing chamber 30 and cylinder wall 32, and piston 36 is positioned on the cylinder wall 32 and connects bent axle 40.Show that firing chamber 30 is communicated with intake manifold 44 and gas exhaust manifold 48 by minute other intake valve 52 and exhaust valve 54.Each intake valve and exhaust valve can be by intake cam 51 and exhaust cam 53 runnings.The position of intake cam 51 can be determined by intake cam sensor 55.The position of exhaust cam 53 can be determined by exhaust cam sensor 57.
Demonstration fuel injector 66 is orientated as and is injected fuel directly in the firing chamber 30, and those skilled in the art is referred to as direct injection.Fuel injector 66 and the signal pulsewidth FPW that comes self-controller 12 be transfer the fuel pro rata.Fuel is transported to fuel injector 66 by fuel system, and this fuel system comprises fuel tank (not shown), petrolift (not shown), petrolift control valve (not shown) and fuel rail (not shown).In addition, metering valve can be positioned in the fuel rail or near fuel rail, is used for closed loop fuel control.The pump metering valve can also be regulated the fuel flow that flow to petrolift, thereby reduces the fuel that is drawn into high pressure fuel pump.
Show that intake manifold 44 is communicated with the electronic throttle 62 of choosing wantonly, electronic throttle 62 is regulated the position of Rectifier plates 64, so that control is from the air-flow of air plenum 46.The air that compressor 162 extracts from suction port (air intake) 42 is supplied with pumping chamber 46.Exhaust rotary turbine machine 164 is coupled to compressor 162 by arbor 161.In some instances, can provide charger-air cooler.Compressor speed can be by regulating variable-vane control 72 position or compressor bypass valve 158 and adjusted.In optional example, wastegate 74 alternative variable-vane controls 72, or except variable-vane control 72, use again wastegate 74.The position of variable geometry turbine blade is regulated in variable-vane control 72.When blade was shown in an open position, exhaust can be passed turbo machine 164, and the energy that makes turbo machine 164 rotations is provided hardly.When blade was in the closed position, exhaust can be passed turbo machine 164, and the power that increase is provided is to turbo machine 164.Perhaps, wastegate 74 allows exhaust stream to cross turbo machine 164, thereby reduces the energy that offers turbo machine.Compressor bypass valve 158 allows to turn back at the pressurized air of compressor 162 outlets the entrance of compressor 162.In this manner, can reduce the efficient of compressor 162, thereby affect the flow of compressor 162 and reduce air-distributor pressure.
When piston 36 near the top dead center compression stroke so that during the fuel automatic ignition, take fire in the firing chamber 30.In some instances, wide territory exhaust oxygen (UEGO) sensor 126 can be coupled to the gas exhaust manifold 48 of tapping equipment 70 upstreams.Further, in some instances, the UEGO sensor can be the NOx sensor that has simultaneously NOx and oxygen sense cell.The outlet pipe NOx in NOx sensor 127 sampling SCR70 downstreams.
Under low engine temperature, glow plug 68 can convert electric energy to heat energy, thereby improves the temperature in the firing chamber 30.By improving the temperature of firing chamber 30, can be more easily by ignition by compression cylinder air-fuel mixture.
In an example, tapping equipment 70 can comprise SCR catalyst converter brick.In another example, can use multiple emission control system, wherein every kind of emission control system all has a plurality of bricks.In an example, tapping equipment 70 can comprise oxidation catalyzer.In other examples, tapping equipment can be included in rare NOx catcher and/or the diesel particulate filter (DPF) after the selective catalytic reduction (SCR).Urea can be ejected into by urea-spray device 90 upstream of SCR catalyst converter 70.Urea-spray device 90 receives urea from urea box 91.Level sensor 93 sensings are stored in the urea amount in the urea box 91.
Exhaust gas recirculatioon (EGR) can offer motor by EGR valve 80.EGR valve 80 is three-way valve, and it is closed or allows exhaust to flow to the position of the engine aspirating system of compressor 162 upstreams from tapping equipment 70 downstreams.In optional example, EGR can flow to from the upstream of turbo machine 164 intake manifold 44.EGR can walk around cooler for recycled exhaust gas 85, or alternatively, EGR can cool off by flowing through cooler for recycled exhaust gas 85.In other examples, can provide high pressure and low pressure EGR system.
Fig. 1 middle controller 12 is shown as conventional microcomputer, and it comprises: microprocessor unit 102, input/output end port 104, ROM (read-only memory) 106, random access memory 108, keep-alive storage 110 and conventional data/address bus.Display controller 12 also receives multi-signal from the sensor that is coupled to motor 10 except previously discussed those signals, comprising: from the engineer coolant temperature (ECT) of the temperature transducer 112 that is coupled to coolant jacket 114; Be coupled to accelerator pedal 130, be used for the position transducer 134 of the accelerator position that sensing foot 132 regulates; Manifold pressure (MAP) from the pressure transducer 121 that is coupled to intake manifold 44 is measured; Boost pressure from pressure transducer 122; Density of oxygen contained in discharged gas from lambda sensor 126; Come the engine position sensor of the hall effect sensor 118 of self-inductance measurement bent axle 40 positions; The measurement of the air quality that enters motor from sensor 120(for example, hot wire air flowmeter); With the measurement from the throttle position of sensor 58.All right sensing atmospheric pressure (sensor is not shown) is so that controller 12 is processed.In aspect current description preferred, the every rotation of bent axle once, engine position sensor 118 just generates the uniformly-spaced pulse of predetermined quantity, can determine engine speed (RPM) according to these pulses.
During operation, each cylinder in the motor 10 generally experiences four stroke cycle: this circulation comprises aspirating stroke, compression stroke, expansion stroke and exhaust stroke.Usually during aspirating stroke, exhaust valve 54 cuts out, and intake valve 52 is opened.Air is introduced into firing chamber 30 by intake manifold 44, and piston 36 moves to cylinder bottom, thereby increases the volume in the firing chamber 30.Those skilled in the art generally is called lower dead center (BDC) with piston 36 near the cylinder bottom and in the position of its stroke endpoint (for example, when firing chamber 30 is in its maximum volume).During compression stroke, intake valve 52 and exhaust valve 54 are closed.Piston 36 moves towards cylinder head, thus the air in the compression and combustion chamber 30.Those skilled in the art generally is in piston 36 its stroke endpoint and is called top dead center (TDC) near the point (for example, when firing chamber 30 is in its minimum volume) of cylinder head.In the process of spraying, fuel is introduced into the firing chamber.In some instances, can repeatedly be injected into cylinder at single cylinder cycle period fuel.In the process hereinafter referred to as igniting, the fuel of injection is lighted by ignition by compression, causes burning.During expansion stroke, the gas push piston of expansion 36 returns towards BDC.Bent axle 40 changes the piston moving rotating into the rotation torque of running shaft.At last, during exhaust stroke, exhaust valve 54 is opened, and the air-fuel mixture after the burning is discharged into gas exhaust manifold 48, and piston turns back to TDC.
Note, abovely describe as just example, and intake valve and the timing of exhaust valve open and/or closed can change, thereby provide the overlapping or negative valve overlap of positive valve, the retarded admission door is closed or multiple other examples.Further, in some instances, can use the two-stroke circulation, rather than four stroke cycle.
With reference to figure 2, SCR catalyst converter transformation efficiency is shown with respect to the drawing of SCR catalyst converter intake temperature; The draw example of NOx transformation efficiency of tapping equipment 70 of 200 presentation graphs 1.Y-axis represents the NOx transformation efficiency that represents with percentage.X-axis represents the SCR intake temperature with degree centigrade expression.
202 demonstrations of SCR efficiency curve, emission control system 70 has low NOx transformation efficiency 150 ° of temperature below the C.For example, the NOx transformation efficiency is about percent 40 under 150 ° of C, and the lower NOx transformation efficiency of intake temperature is lower.At about 185 ° of C, the NOx transformation efficiency increases sharply and reaches about percent 90, shown in vertical marker 204.At 185 ° more than the C, the NOx transformation efficiency of emission control system 70 slowly increases, and near percent 100 efficient.Near 390 ° of C, it is about percent 90 that the NOx transformation efficiency rolls back, shown in vertical marker 206.Along with the SCR intake temperature continues to increase, the NOx transformation efficiency continues to descend.In this example, the zone between the vertical marker 204 and 206 can be predetermined SCR catalyst converter operation range, wherein regulates engine parameter, thereby improves the motor fuel Economy.
Therefore, can observe, can be expected at running SCR in the temperature range that ideal efficiency level (for example, percent 90 or more than) is provided.When SCR when efficient region turns round, can reduce motor fuel consumption, and the emission by exhaust pipe level (for example, treated and be discharged into the engine exhaust discharging of atmosphere) of expectation still is provided.Offer the EGR amount of motor by minimizing, can improve the motor fuel Economy, simultaneously by discharging transforms to gas (engine feed gas) (for example, motor is given vent to anger (engine out gas)) with the motor of higher level at the emission control system of greater efficiency zone running.In addition, can shift to an earlier date injection timing and/or ignition timing, thereby further reduce the motor fuel consumption of emission control system under the working order of greater efficiency zone.
Refer now to Fig. 3, SCR catalyst converter NH is shown 3Memory space and EGR gain are with respect to the drawing of time.Particularly, drawing 300 illustrates the NH that how can respond storage in the SCR catalyst converter 3Amount is regulated two examples of the EGR amount that offers motor.
The first Y-axis represents to be stored in the NH in the SCR 3Amount.The NH of storage 3Amount increases in the Y-axis direction of arrow.The second Y-axis represents the EGR gain.The EGR gain increases in the Y-axis direction of arrow.X-axis represents the time, and the right side to Fig. 3 increases from the left side of Fig. 3 the time.
In an example, be inserted in the multiplier of the basic EGR amount that is stored in independent platform between measuring with FE pattern EGR in EGR gain expression is used for.For example, basic EGR amount can be 30%, and FE pattern EGR amount is 23%.Basic EGR is deducted from FE pattern EGR, then multiply by the EGR gain.The result adds and basic EGR, revises the EGR amount.Can adjust similarly fuel injection timing, fuel pressure, supercharging and other parameters.
Described in 514 and 526, basic EGR amount and FR EGR amount can be based on engine speed, engine loading and engineer coolant temperatures.Note, basic EGR amount can be with engine speed, load and temperature change, in order to multiple different EGR amount is offered the motor that is in multiple different engine speed, load and temperature.The EGR gain can be the value between 0 and 1.In an example, the EGR gain has the value less than 1, at this moment SCR catalyst converter NH 3Memory space expects that at this SCR catalyst converter efficient is greater than threshold value efficient greater than predetermined SCR memory space.When SCR catalyst converter memory space from NH 3Threshold quantity when reducing, the EGR multiplier can increase towards 1.Therefore, if the SCR catalyst converter does not turn round in prespecified range---greater than predetermined threshold, motor can be with the running of basic EGR amount so in this SCR memory space.
The NH of storage in the curve 302 expression SCR catalyst converters 3Amount.The NH of storage in the SCR catalyst converter 3Amount is also corresponding to employed SCR NH 3The percentage of storage capacity.Curve 302 demonstrations are stored in the SCR catalyst converter along with the time increases and the NH of minimizing 3Amount.Work as NH 3NOx is changed into N 2And H 2O and when consuming, be stored in the NH in the SCR 3Amount can reduce.
Curve 304 is used for regulating two different Schedules that EGR gains with 306 examples.Curve 304 makes the EGR gain along with the NH that is stored in the SCR catalyst converter 3Amount reduces and increases.Curve 304 makes the EGR gain along with the NH that is stored in the SCR catalyst converter 3Amount increases and reduces.Therefore, when the SCR catalyst converter in efficient region running, be stored in the NH in the SCR 3When amount increased, the EGR gain reduced the EGR amount that is transported to motor.Further, when the SCR catalyst converter in efficient region running, be stored in the NH in the SCR 3When amount reduced, the EGR gain increased the EGR amount that is transported to motor.Show that curve 304 is along with the NH of storage 3Reduce and linear increasing.Yet such as need, the EGR gain can be nonlinear.
Curve 306 shows as the NH that is stored in SCR 3Amount is in or less than the predetermined NH shown in the horizontal line 310 3The cascade of the EGR gain during memory space changes.For example, the NH in being stored in the SCR catalyst converter 3Amount is during less than threshold value, and the EGR gain can fade to 1 from being worth 0.8.Further, as mentioned above, can respond the NH that has been used 3Storage capacity percentage or untapped NH on the contrary 3Storage capacity percentage is regulated the EGR gain.Can be according to the predetermined NH of regulating working conditions by horizontal line 310 expressions 3Amount is so that EGR gain changes being different from level shown in Figure 3.
Refer now to Fig. 4, the urea deposits thing is shown forms illustrative plot regional and that the restriction of EGR component forms based on the urea deposits thing.Can be applied to the method for Fig. 5 about the method for Fig. 4 description.
Draw and 400 to show sediments and can be formed at exemplary area 403 in the vent systems by spraying urea.In an example, can determine, when the urea flow velocity surpassed in the engine exhaust flow velocity of appointment and the threshold flow rate under the temperature, sediments began to be formed in the vent systems.The curve 402 exemplary boundary that to be sedimentss begin to form in vent systems during to vent systems at urea-spray.In this example, curve 402 expression when the exhaust quality flow velocity is low under low urea flow velocity the urea deposits thing begin formation.Along with the exhaust quality flow velocity increases, the urea flow velocity necessarily also increases, thereby sediments forms in vent systems.When the urea flow velocity reached the threshold level of 412 expressions, sediments formed in vent systems.Therefore, even the exhaust quality flow velocity continues to increase, urea deposits still continues to form.
In some instances, the urea flow velocity can be restricted to less than the level shown in 412, so that the urea deposits thing does not form in vent systems.In this manner, can respond the sediment yield restriction urea amount that can in vent systems, form.
Curve 404 expressions can offer the EGR amount of motor.Curve 404 can represent that the EGR that provides with constant engine speed measures.Further, will be appreciated that, 404 shape only is example, the description but not intention limits by any way or narrows.Show that curve 404 is in low-level under low exhaust quality flow velocity, show that few EGR flow to motor under low engine speed and load.Curve 404 increases and shows, along with the motor flow increases, extra EGR is provided for motor.Yet, no longer include when increasing exhaust mass flow that the EGR amount reaches the limit shown in 410 when helping prevent urea deposits.Therefore, the such urea flow velocity of response limits the EGR amount: sediments can form in vent systems more than it.In other words, the formation of urea deposits thing limits EGR amount and urea flow velocity in the response vent systems.
Refer now to Fig. 5, the exemplary process diagram of method of fuel economy that has the vehicle of SCR catalyst converter for raising is shown.The method of Fig. 5 can be carried out by the instruction in the nonvolatile storage that is stored in controller as shown in fig. 1.When urea storage box non-NULL, the method for Fig. 5 can be regulated the urea that offers vent systems.
502, method 500 is determined operating mode.Operating mode can include but not limited to engine speed, engine loading, SCR temperature, be stored in urea amount in the case, be stored in the NH in the SCR catalyst converter 3Amount.Engine speed and load and other sensing engine variables can be determined based on voltage or electric current output from sensor.In an example, can determine to be stored in the interior NH of SCR catalyst converter 3Amount is " METHOD FOR CORRECTING AN ESTIMATE OF NH such as title 3STORED WITHIN A SELECTIVE CATALYST REDUCTION SYSTEM " U.S. Patent Application No. 13/071,252 described in, its content is introduced into this paper in the reference mode, is used for all purposes and intention.After determining engine operating condition, method 500 proceeds to 504.
504, method 500 determines that baseline urea uses and recharge the interval.Baseline urea recharges the interval and can pre-determine and be stored in the storage.In an example, baseline urea recharges the interval and is equal to engine running time or the Vehicle Driving Cycle distance of using single case fuel.In another example, baseline urea recharges the interval and is equal to and is suitable for changing oil/engine running time or the Vehicle Driving Cycle distance at oil exchange interval.For example, oil change interval can be defined as 6000 kilometers (KM).Similarly, to recharge the interval be 6000 kilometers to baseline urea.Such as need, can provide other baseline urea to recharge the interval based on urea box volume and its dependent variable.
Method 500 also determines that 504 baseline urea uses the interval.In an example, based on determining that through the Vehicle Driving Cycle distance of appointment or the urea amount of engine running time use baseline urea uses the interval.For example, according to the amount of time that starts the urea-spray device with the pressure that urea offers sparger can be determined to be ejected into the urea amount of vent systems.Urea-spray device transfer function (transfer function) is described the flow velocity that passes through the urea-spray device when under setting pressure urea being offered sparger.The urea flow velocity multiply by urea flow velocity elapsed time amount, determines the urea amount that sprays.Operating range or engine running amount of time provide baseline urea to use speed divided by the urea amount that is ejected into vent systems.Urea uses speed to average based on Vehicle Driving Cycle distance or the engine running time of appointment, provides average baselining urea to use speed.Use speed to multiply each other by the urea amount that will be stored in the urea box with average urea, can determine that baseline urea uses the interval.Therefore, to use the interval be that engine running time or the Vehicle Driving Cycle distance that provides can be provided for urea in the urea storage box to baseline urea.During engine running, can periodically determine and upgrade baseline urea and use the interval.After definite urea used and recharges the interval, method 500 proceeded to 506.
506, method 500 judges whether the condition that allows to enter fuel economy increase pattern exists.In an example, when the SCR that is coupled to motor turns round in the prespecified range of SCR efficient greater than threshold level, can provide to enter the license that fuel economy increases pattern.Can estimate SCR catalyst converter efficient based on the SCR temperature.Therefore, as shown in Figure 2, when the SCR temperature is between 185 ° of C and 390 ° of C---this moment, predetermined SCR efficient was percent 90, and the license that enters fuel economy mode can be provided.In this manner, the SCR temperature based on being associated with SCR efficient can provide the license that enters fuel economy mode.In other examples, when the NOx sensor that is positioned at SCR the place ahead and rear is indicated SCR efficient greater than threshold value efficient (for example, 95% efficient), can provide the license that enters fuel economy mode.For example, if be positioned at that the NOx sensor of SCR upstream is indicated the NOx of 1.0 Grams Per Seconds and the NOx sensor in downstream when indicating the NOx of 0.045 Grams Per Second, can determine to allow to enter fuel economy mode.If allow to enter fuel economy mode, answering so is "Yes", and method 500 proceeds to 520.If do not allowing to enter fuel economy mode when precondition, answering so is "No", and method 500 proceeds to 510.
510, method 500 judges whether operating mode approaches the condition that allows to enter fuel economy mode.In an example, when SCR efficient is in the predetermined threshold range of the SCR efficient of expectation, can judge that operating mode approaches the condition that allows to enter fuel economy mode.Can estimate SCR efficient according to SCR temperature or the NOx sensor that is positioned at the SCR upstream and downstream.In other examples, the scheduled time measures the energy fluence that can save and compares if the energy fluence that the condition that realizes entering fuel economy mode is consumed and motor turn round under fuel economy mode.For example, SCR temperature and efficient can be increased to the required post-injection fuel estimator of predeterminated level (for example, spraying the later stage at power stroke or the fuel in exhaust stroke) and compare by the fuel quantity of being saved with low EGR amount running engine scheduled time amount.The fuel quantity that increases the required fuel quantity of SCR temperature and saved with low EGR amount running engine the time can be determined by rule of thumb, and is stored in the storage.In an example, to (for example improve uniform temperature for making the SCR catalyst converter, 5 ° of C) fuel quantity that sprays and the fuel quantity of saving by minimizing EGR amount when SCR is in Efficient Conversion state (for example, the SCR temperature is greater than threshold temperature) scheduled time amount (for example, 1 minute) are compared.If judging, method 500 need 0.1 liter of fuel that the SCR temperature is increased to SCR with the temperature of threshold value efficient running, and when the SCR catalyst converter turns round with threshold value efficient by saving 0.15 liter fuel in one minute with the EGR running engine that reduces, method 500 will provide post-injection fuel so, thereby improve the SCR temperature, then reduce the EGR amount, to save 0.05 liter of fuel.If method 500 judges that operating mode approaches the condition that allows to enter fuel economy mode, answering so is "Yes", and method 500 proceeds to 512.Otherwise answer is "No", and method 500 proceeds to 514.
512, method 500 is regulated engine running, to realize allowing to enter the condition of fuel economy mode.In an example, (for example can increase rear internal-combustion, the fuel that sprays of later stage be power stroke or in exhaust stroke) fuel quantity, thereby regulate engine running so that SCR will realize the condition that allows motor to reach and enter fuel economy increase pattern.In other examples, can postpone the fuel injection timing or reduce supercharging, in order to increase delivery temperature, thereby improve the SCR transformation efficiency.Regulating engine running with after realizing fuel economy increase pattern, method 500 proceeds to end.
514, method 500 is determined basic EGR amount, fuel injection timing and supercharging amount.In some instances, method 500 can also be determined basic ignition in advance (base spark advance).In an example, comprise that the parameter of basic EGR amount, basic fuel injection timing, fueling injection pressure and basic supercharging amount can be determined by rule of thumb, and be stored in the storage.Can responding engine speed and torque demand by concordance list or function from the memory search parameter.In an example, torque demand can be based on the position of accelerator pedal.By regulating EGR valve, fuel injector timing, fuel metering valve position, fuel rail pressure valve pilot pressure and turbocharger vanes or wastegate, provide EGR amount, fueling injection pressure, fuel injection timing (for example, guide (pilot) fuel injection amount, pilot fuel injection timing, the fuel quantity that sprays at cylinder each fuel of cycle period) and supercharging with the level of table output.After definite basic EGR amount, fuel pressure, fuel injection timing and supercharging amount, method 500 proceeds to 516.
516, method 500 is regulated the urea-spray flow velocity that leads to engine exhaust system, to satisfy the engine/vehicle emissions requirements, simultaneously with basic EGR, injection timing, supercharging amount running engine.In an example, the urea flow velocity is determined by rule of thumb, and is stored in the table of storage.By current engine speed and torque demand value or respond basic EGR speed, injection timing and supercharging amount, can index urea tachograph.Value in the urea tachograph by instruction to urea-spray device and urea pump.Urea-spray device opening time and urea pump jet pressure are regulated by transfer function, and this transfer function makes urea flow velocity and sparger associate in time and urea pressure.Then, running urea-spray device and urea pump, thus the urea flow velocity of expectation is provided.After regulating the urea flow, method 500 proceeds to 518.
518, the basic EGR of method 500 outputs, fueling injection pressure, fuel injection timing and supercharging amount.Consider the pressure between vent systems and the intake manifold, provide basic EGR amount by the position regulation with the EGR valve to the position that expectation EGR amount is provided.In other examples, by changing the valve-opening time lap between intake valve and the exhaust valve, can regulate the EGR amount.For example, can reduce the EGR amount by the valve-opening time amount that reduces between intake valve and the exhaust valve.By the crank position of morning begins so that fuel is injected in cylinder cycle period, come the timing of fuel metering sparger.Fuel pressure can be regulated by fuel metering pump metering valve or fuel rail pressure control valve.The supercharging amount can be regulated by the position of regulating turbo-charger exhaust valve, the position of regulating turbocharger vanes position or adjusting by-pass valve.After regulating EGR, fuel injection timing and supercharging, method 500 proceeds to end.
520, method 500 judges that the urea amount that is stored in the urea storage box is whether greater than the urea estimator that reaches urea and recharge the interval.For example, if determine that 504 it is 500KM that urea recharges the interval, the baseline urea that method 500 is determined from 504 recharges the interval and deducts baseline urea use interval.If the result is negative value, can determine the excessive urea of storage in the urea box of engine/vehicle, recharge the interval to satisfy urea.If the result be on the occasion of, can determine to be stored in urea in the urea box and be less than and satisfy urea to recharge the interval required.If method 500 judges the urea amount that is stored in the urea box and realize recharging the amount at interval greater than engine/vehicle, answer so and be "Yes", and method 500 proceeds to 526.Otherwise, answers and be "No", and method 500 proceeds to 522.
522, method 500 reduces the urea amount of the vent systems that is ejected into the SCR upstream.The efficient of response SCR can reduce the urea amount of injection.SCR efficient can be estimated by the SCR temperature or based on the NOx sensor output that is positioned at the SCR upstream and the difference that is positioned at the NOx sensor output in SCR downstream.For example, if SCR NOx transformation efficiency is higher than the NOx transformation efficiency that expection vehicular discharge level is provided, reduce so the urea amount that sprays.In some instances, when SCR NOx transformation efficiency surpass the NOx transformation efficiency that expection vehicular discharge level is provided add the extra NOx transformation efficiency factor and the time, can reduce the urea amount of injection.The urea amount that sprays can reduce pro rata or reduce as the function greater than the NOx transformation efficiency of threshold value NOx efficient.After minimizing was ejected into the urea amount of vent systems of SCR upstream, method 500 proceeded to 524.
524, the basic EGR of method 500 outputs, basic fueling injection pressure, basic fuel injection timing and basic supercharging amount.Output basic EGR, fuel injection timing and supercharging described in 514.After the basic EGR of output, basic fueling injection pressure, basic fuel injection timing and basic supercharging, method 500 proceeds to end.
526, method 500 is determined fuel economy (FE) pattern EGR amount, fuel injection timing and supercharging amount.In some instances, method 500 can also determine that the fuel economy basic ignition in advance.The parameter that comprises FE pattern EGR amount, FE mode fuel injection timing, FE mode fuel jet pressure and FE pattern supercharging amount is determined by rule of thumb, and is stored in second group of table of the storage that is similar to 514 described tables.Yet, to compare with the table output 514, the table 526 provides the FE of increase.Can responding engine speed and torque demand by concordance list or function search argument from storage.By regulating EGR valve, fuel metering valve position, fuel rail pressure valve pilot pressure, sparger timing and turbocharger vanes or wastegate, provide EGR amount, fueling injection pressure, fuel injection timing (for example, pilot fuel injection amount, pilot fuel injection timing, the fuel quantity that sprays at cylinder each fuel of cycle period) and supercharging with the level of table output.After definite FE pattern EGR amount, FE mode fuel pressure, FE mode fuel injection timing and FE pattern supercharging amount, method 500 proceeds to 528.
528, method 500 responses allow to reach the level increase urea injecting quantity that urea recharges the interval.For example, if it is 500KM that baseline urea uses the interval to use speed based on average urea, and it is 300KM based on vehicle operating range or engine running time that urea recharges the interval, can increase urea injecting quantity so, recharges the interval so that urea uses the interval to drive to urea.In an example, urea injecting quantity and the urea difference of using interval and urea to recharge the interval increases pro rata.Urea uses the interval and recharges the interval and can upgrade in the Vehicle Driving Cycle cyclic process.When urea box is full of and along with urea-spray reduces until urea box when recharging, recharges the interval and is in maximum value.Urea uses the interval to use speed change and renewal for several times along with average urea uses speed and urea in the Vehicle Driving Cycle cyclic process.After increasing urea injecting quantity, method 500 proceeds to 530.
530, method 500 limit injection are to the urea amount of vent systems.Enter the urea flow velocity of exhaust based on the sediments restriction that can in vent systems, form.In an example, enter the urea flow velocity of exhaust based on exhaust flow rate and delivery temperature restriction.For example, the urea flow velocity of the urea deposits thing in the minimizing vent systems of determining by rule of thumb is to determine by rule of thumb, and is stored in the table of storage.Exhaust mass flow and delivery temperature concordance list, and the output urea flow velocity limit.Urea flow velocity by urea flow velocity limit restriction instruction.After limiting the urea flow velocity owing to the urea deposits thing, method 500 proceeds to 532.
532, response is stored in the NH in the SCR catalyst converter 3Amount and/or SCR catalyst temperature, method 500 is determined EGR amount, urea injecting quantity, fuel injection timing and boost pressure regulation.In an example, based on show about Fig. 3 and explanation be stored in NH in the SCR catalyst converter 3Amount is regulated the EGR amount that offers motor.Further, regulate the EGR amount based on function or the factor of SCR temperature.Especially, response is stored in the NH in the SCR catalyst converter 3Amount and/or SCR catalyst temperature are regulated EGR increment (gain term).From FE pattern EGR table, deduct the output of basic EGR scale, and result and EGR increment are multiplied each other, then add and arrive basic EGR and measure.For example, be 30% in basic EGR amount, FE pattern EGR be 25% and the EGR gain be 0.75, and along with the NH that is stored in the SCR 3Measure in the situation that increases and increase, output EGR amount is (25-30) * 0.75+30=26.5.Storage NH 3The value of EGR increment of SCR less than 1, or greater than the threshold value NH of SCR 3Storage capacity,, and as the NH that is stored among the SCR 3Reduce to the threshold value NH of SCR 3When storage capacity was following, the EGR increment was near numerical value 1.
Similarly, response is stored in the NH of SCR 3Amount and SCR temperature, the increment of fuel metering pressure, fuel injection timing and supercharging amount.Sparger timing increment is along with the NH that is stored among the SCR 3Amount increases and increases, thereby injection timing begins in advance, and sparger timing increment is along with the NH that is stored among the SCR 3Amount reduces and reduces, thereby the delayed injection timing begins.For example, as the NH that is stored in the increase in the SCR 3Function shift to an earlier date the fuel injection timing and begin.In an example, be stored in the interior NH of SCR 3Each predetermined percentage increment make fuel injection amount shift to an earlier date bent axle degree (crankshaft degree).The supercharging gain is along with the NH that is stored in the SCR 3Amount increases and reduces, thereby reduces supercharging, and the supercharging gain is along with the NH that is stored in the SCR 3Amount reduces and increases, thereby improves supercharging.In spark ignition engine, along with the NH that is stored among the SCR 3Amount increases, can be towards the timing of MBT early spark.
Urea injecting quantity and motor NOx output increase pro rata and increase.For example, motor NOx output can be determined by sensor 126, and urea injecting quantity can increase pro rata increase with motor NOx.When the EGR amount increased, urea injecting quantity can also reduce pro rata with the NOx reduction.After regulating engine EGR amount, fuel pressure, engine fuel injection timing and supercharging, method 500 proceeds to 534.
In the example that the EGR amount reduces, be ejected into the fuel quantity of pilot fuel injection by fuel metering sparger timing increase.Further, can reduce and the pilot fuel injection that reduces injection timing begins along with EGR amount.Further, can be along with the EGR amount that offers motor reduces and minimizing supercharging amount and fuel pressure.
In another example, be inserted between base table and the FE pattern list NH in being stored in SCR in the replacement 3Use base table during less than threshold level or threshold quantity.NH in being stored in SCR 3Use the FE pattern list during greater than threshold level or threshold quantity.This running by to Fig. 3 in 306 similar curves provide.
534, method 500 is regulated engine EGR amount, injection timing, urea injecting quantity, fuel pressure and supercharging, thereby improves motor and vehicle fuel economy.Can reduce the engine EGR amount by regulating valve position or cam timing described in 518.Further, shift to an earlier date the beginning of fuel injection timing with respect to crank position.Also reduce supercharging by leaf position or the compressor valve of described in 518, regulating turbosupercharger.Reduce supercharging delivery temperature is increased, and injection timing reduces delivery temperature in advance.Therefore, boost pressure can be offset or the fuel injection beginning of balance injection timing by reducing.After regulating EGR amount, fuel injection timing and supercharging, method 500 finishes.Can increase the urea amount of injection by increasing injection duration and/or urea-spray pressure, and increase motor output NOx.
Therefore, the method for Fig. 5 is provided for running engine, comprising: response is stored in the NH in the SCR catalyst converter 3Measure and be stored in the urea amount of case and regulate the EGR amount that offers motor.The method comprises following situation: regulate the EGR amount and be included in the urea amount that is stored in the case and surpass and reduce the EGR that offers motor when vehicle reaches the required estimation urea amount of the predetermined condition relevant with urea amount in the case and measure.In this manner, under the SCR of SCR more efficient condition, can increase the motor fuel Economy.
The method comprises that also fixed condition is the situation that case recharges event.The method comprises that further predetermined condition is the situation that oil change interval finishes.The method also comprises following situation: regulate the EGR amount and be included in the NH that is stored in the SCR catalyst converter 3Amount reduces the EGR amount that offers motor during greater than threshold quantity.The method also comprises following situation: regulate the EGR amount and be included in the NH that is stored in the SCR catalyst converter 3Amount increases the EGR amount that offers motor during less than threshold quantity.The method also comprises following situation: just respond the NH that is stored in the SCR catalyst converter when only having temperature when the SCR catalyst converter in prespecified range 3Amount is regulated the EGR amount that offers motor.The method comprises that further response is stored in the NH in the SCR catalyst converter 3Amount and the urea amount that is stored in the case are regulated supercharging or the timing of fuel injection beginning.
In an example, the method for Fig. 5 also is provided for the method for running engine, and the method comprises: the urea amount that response is stored in the case is regulated the EGR amount that offers motor; Sediments estimator limit injection in the response vent systems is to the urea amount of the vent systems of SCR catalyst converter upstream; And the urea amount restriction of response injection offers the minimizing of the EGR amount of motor.The method also comprises following situation: sediments is formed with the sediments estimator based on engine exhaust mass velocity and delivery temperature by the urea amount that sprays.
In some instances, the method comprises that further also response is stored in the NH in the SCR catalyst converter 3Amount is regulated the situation of the EGR amount that offers motor.The method also is included in the NH that is stored in the SCR catalyst converter 3When reducing, amount increases the situation of the EGR amount that offers motor.Therefore, the efficient SCR running under the selected condition of the method utilization of Fig. 5.The method is included in the NH that is stored in the SCR catalyst converter 3When increasing, amount reduces the situation of the EGR amount that offers motor.The method further is included in when the EGR amount that offers motor reduces and shifts to an earlier date the fuel injection beginning of injection timing or reduce engine booster.The method further is included in and reduces the urea amount that is ejected into vent systems when the urea amount that is stored in the case reaches the required estimation urea amount of predetermined condition less than vehicle.
In another example, the method for Fig. 5 is provided for running engine, and it comprises: response is in the SCR catalyst converter property regulation engine operating condition in the performance prespecified range, to enter fuel economy mode; The SCR catalyst converter property regulation that reaches threshold level with response offers the EGR amount of motor.In this manner, in efficient SCR operation process, can increase the motor fuel Economy.
The method comprises following situation: after SCR catalyst converter performance reached threshold level, response was stored in the NH in the SCR catalyst converter 3Amount, SCR catalyst temperature and the urea amount that is stored in the case are further regulated the EGR amount.The method comprises that also threshold level is the situation of predetermined efficient, further is included in the urea amount that is stored in the case and is not more than and reduces the urea amount that is ejected into the vent systems that comprises the SCR catalyst converter when vehicle reaches the urea amount of predetermined condition.The method also is included in when the EGR amount that offers motor reduces and reduces supercharging or shift to an earlier date the situation that the fuel injection timing begins.The method further comprises increases the urea amount that is ejected into the vent systems that makes the raising of SCR catalyst converter efficient that comprises the SCR catalyst converter, allows simultaneously vehicle to reach the predetermined condition relevant with urea amount in the case.
Refer now to Fig. 6, provide EGR to measure the vehicle of regulating.Vehicle 600 comprises motor 10 and SCR70.Motor 10 can drive vehicle 600 and travel at highway under different riving conditions.When motor 10 running, SCR70 processes the exhaust from motor 10.
Those of ordinary skill in the art will understand, and the method for describing among Fig. 5 can represent one or more in any number of processing policy, for example event driven, drives interrupts, Multi task, multithreading etc.Similarly, shown different step or function can according to shown in order execution, executed in parallel or omit in some cases.Similarly, processing sequence realizes that not necessarily purpose described herein, Characteristics and advantages are desired, but provides in order conveniently to illustrate and to describe.Although clearly do not illustrate, those of ordinary skill in the art will recognize, depend on that employed specific strategy can repeat one or more in exemplary step, method or the function.
This paper has summarized explanation.Those skilled in the art will expect multiple changes and improvements to the reading of specification, and not break away from the spirit and scope of this explanation.For example, single cylinder, I2, I3, I4, I5, V6, V8, V10, V12 and the V16 motor that turns round with rock gas, gasoline, diesel oil or alternative fuel configuration can utilize this explanation and optimize.

Claims (10)

1. the method for a running engine, described method comprises:
Response is stored in the NH in the SCR catalyst converter 3Amount and the urea amount that is stored in the case are regulated the EGR amount that offers motor.
2. method according to claim 1 is wherein regulated the described EGR that described EGR amount comprises that minimizing when described urea amount when being stored in described case in surpasses vehicle and reaches the desired estimation urea amount of the predetermined condition relevant with urea amount in the described case offers described motor and is measured.
3. method according to claim 2, wherein said predetermined condition is that fuel tank recharges event.
4. method according to claim 2, wherein said predetermined condition are that oil change interval finishes.
5. method according to claim 1 is wherein regulated described EGR amount and is comprised as the NH that is stored in described SCR catalyst converter 3Amount reduces the described EGR amount that offers described motor during greater than threshold quantity.
6. method according to claim 1 is wherein regulated described EGR amount and is comprised as the NH that is stored in described SCR catalyst converter 3Amount increases the described EGR amount that offers described motor during less than threshold quantity.
7. method according to claim 1 just responds the NH that is stored in the described SCR catalyst converter when wherein only having temperature when described SCR catalyst converter in prespecified range 3Amount is regulated the described EGR amount that offers described motor.
8. method according to claim 1 comprises that further response is stored in the described NH in the described SCR catalyst converter 3Measure and be stored in described urea amount fuel metering injection beginning timing or supercharging amount in the described case.
9. the method for a running engine, described method comprises:
The urea amount that response is stored in the case is regulated the EGR amount that offers motor;
The sediments estimator limit injection that response forms in vent systems is to the urea amount of the described vent systems of SCR catalyst converter upstream; With
The urea amount restriction that response is sprayed offers the minimizing of the described EGR amount of motor.
10. method according to claim 9, wherein said sediments is formed by the urea of the described amount of spraying, and wherein the sediments estimator based on engine exhaust mass velocity and delivery temperature.
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